As noted earlier in this article series, we would be tackling a race intake system to go along with our bolt-on unit. So what makes the race system different? For this particular system we are using a larger-diameter intake pipe with a larger MAF housing. This means greater intake flow, but it also means it will no longer function with the factory tune. This system is meant specifically for drivers who want aggressive professional tunes so they can take advantage of airflow modifications such as larger turbochargers and high boost pressures.

Because the 15’ model shares the EJ from the previous generation, we would be using the same intake pipe and filter as we did with our 2008–2014 kit. This unit is shown below.

Race intake pipeMishimoto air filter

Here is a look at this system fitted to a 2010 STi!

Mishimoto 2008–2014 Race Intake installed

So, all we truly needed was to design an airbox that would accommodate this pipe and function with the body of the new 15’ model.